How does KAYAK find such low prices on flights from Ontario to Seattle?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Ontario to Seattle?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$183 CHEAP FLIGHTS from Ontario to Seattle

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Cheap Flights from Ontario to Seattle

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Ontario to Seattle

Thu, Oct 15 - Wed, Oct 21

7:15 am - 6:45 pmYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

14h 30m1 stop Calgary

7:35 pm - 7:05 amSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

8h 30m1 stop Calgary

$308WestJet

Sat, Oct 17 - Sat, Oct 24

12:25 pm - 6:45 pmYOW Ottawa-SEA Seattle/Tacoma Intl

9h 20m2 stops Winnipeg Calgary

7:35 pm - 5:35 amSEA Seattle/Tacoma Intl-YOW Ottawa

7h 00m1 stop Calgary

$318WestJet

Fri, Nov 20 - Mon, Nov 30

6:10 am - 1:40 pmYOW Ottawa-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

5:48 pm - 12:01 amSEA Seattle/Tacoma Intl-YOW Ottawa

27h 13m1 stop Calgary

$320Multiple Airlines

Fri, Jan 8 - Sat, Jan 16

12:06 pm - 8:16 pmYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

11h 10m1 stop Chicago O'Hare Intl

11:28 pm - 11:26 amSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

8h 58m1 stop Chicago O'Hare Intl

$329American Airlines

Sat, Oct 31 - Sat, Nov 7

7:00 am - 4:58 pmYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

12h 58m1 stop Minneapolis St Paul

8:25 am - 11:22 pmSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

11h 57m1 stop Minneapolis St Paul

$331Delta

Wed, Jan 13 - Thu, Jan 21

12:45 pm - 12:09 amYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

14h 24m1 stop Atlanta Hartsfield-Jackson

6:00 am - 3:59 pmSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

6h 59m1 stop Detroit Metropolitan Wayne County

$365Delta

Sat, Oct 24 - Sat, Oct 31

5:00 am - 10:05 amYOW Ottawa-SEA Seattle/Tacoma Intl

8h 05m1 stop Vancouver Intl

8:40 am - 11:11 pmSEA Seattle/Tacoma Intl-YOW Ottawa

11h 31m2 stops Vancouver Intl Calgary

$393Air Canada

Fri, Nov 13 - Tue, Nov 17

7:45 am - 2:37 pmYOW Ottawa-SEA Seattle/Tacoma Intl

9h 52m1 stop Vancouver Intl

7:45 am - 7:45 pmSEA Seattle/Tacoma Intl-YOW Ottawa

9h 00m1 stop Toronto Pearson Intl

$395Air Canada

Fri, Nov 13 - Tue, Nov 17

4:46 pm - 11:20 pmYOW Ottawa-SEA Seattle/Tacoma Intl

9h 34m1 stop Chicago O'Hare Intl

3:49 pm - 2:09 pmSEA Seattle/Tacoma Intl-YOW Ottawa

19h 20m2 stops Denver Intl Chicago O'Hare Intl

$398United Airlines

Fri, Nov 20 - Sun, Nov 22

5:15 pm - 7:47 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 32mnonstop

8:31 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 34mnonstop

$434Alaska Airlines

Recent last minute flight deals from Ontario to Seattle

Fri, Sep 25 - Sat, Oct 3

8:00 pm - 9:40 amYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

16h 40m1 stop Calgary

7:35 pm - 7:05 amSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

8h 30m1 stop Calgary

$315WestJet

Wed, Sep 23 - Sat, Sep 26

7:15 am - 6:45 pmYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

14h 30m1 stop Calgary

7:35 pm - 7:05 amSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

8h 30m1 stop Calgary

$320WestJet

Thu, Sep 24 - Sat, Oct 3

4:55 pm - 7:13 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 18mnonstop

10:30 am - 10:45 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

9h 15m1 stop Calgary

$475Multiple Airlines

Wed, Sep 23 - Fri, Sep 25

4:55 pm - 7:13 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 18mnonstop

7:35 pm - 6:55 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

20h 20m1 stop Calgary

$505Multiple Airlines

Thu, Sep 24 - Sat, Oct 3

5:16 pm - 11:26 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 10m1 stop San Francisco

11:13 pm - 9:54 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

7h 41m1 stop Chicago O'Hare Intl

$528United Airlines

Fri, Sep 25 - Sat, Oct 3

5:10 pm - 10:05 pmYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

7h 55m1 stop Detroit Metropolitan Wayne County

6:00 am - 4:19 pmSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

7h 19m1 stop Detroit Metropolitan Wayne County

$557Delta

Fri, Sep 25 - Sat, Oct 3

5:10 pm - 10:05 pmYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

7h 55m1 stop Detroit Metropolitan Wayne County

8:59 am - 11:50 pmSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

11h 51m1 stop Atlanta Hartsfield-Jackson

$559Delta

Fri, Sep 25 - Sat, Oct 3

6:00 pm - 10:47 pmYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

7h 47m1 stop Vancouver Intl

3:00 pm - 7:10 amSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

13h 10m2 stops Vancouver Intl Edmonton

$586Air Canada

Fri, Sep 25 - Sat, Oct 3

8:10 am - 6:32 pmYUL Montreal Pierre Elliott Trudeau Intl-SEA Seattle/Tacoma Intl

13h 22m2 stops Edmonton Vancouver Intl

7:15 pm - 9:55 amSEA Seattle/Tacoma Intl-YUL Montreal Pierre Elliott Trudeau Intl

11h 40m2 stops Vancouver Intl Ottawa

$596Air Canada

Tue, Sep 22 - Thu, Sep 24

12:15 pm - 7:15 pmYTZ Toronto Island-SEA Seattle/Tacoma Intl

10h 00m1 stop Chicago O'Hare Intl

11:13 pm - 10:07 amSEA Seattle/Tacoma Intl-YTZ Toronto Island

7h 54m1 stop Chicago O'Hare Intl

$696United Airlines

Recent direct flight deals from Ontario to Seattle

Thu, Oct 15 - Wed, Oct 21

6:45 pm - 9:04 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 19mnonstop

7:55 am - 3:36 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 41mnonstop

$431Air Canada

Wed, Oct 21 - Thu, Oct 29

6:45 pm - 9:04 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 19mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$434Air Canada

Fri, Nov 20 - Sun, Nov 22

5:15 pm - 7:47 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 32mnonstop

8:31 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 34mnonstop

$434Alaska Airlines

Fri, Nov 20 - Mon, Nov 23

5:15 pm - 7:47 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 32mnonstop

8:31 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 34mnonstop

$434Alaska Airlines

Wed, Oct 7 - Wed, Oct 14

6:45 pm - 9:04 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 19mnonstop

7:55 am - 3:36 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 41mnonstop

$434Air Canada

Wed, Oct 14 - Wed, Oct 21

4:55 pm - 7:26 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 31mnonstop

8:00 am - 3:45 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 45mnonstop

$434Alaska Airlines

Wed, Jan 20 - Wed, Jan 27

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

8:29 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 36mnonstop

$566Multiple Airlines

Sat, Oct 24 - Sat, Oct 31

7:20 pm - 9:39 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 19mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$593United Airlines

Thu, Oct 22 - Tue, Oct 27

6:45 pm - 9:04 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 19mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$601United Airlines

Thu, Oct 8 - Thu, Oct 22

6:45 pm - 9:04 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 19mnonstop

7:55 am - 3:36 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 41mnonstop

$680Multiple Airlines

Useful Info

Low season	January
High season	June
Cheapest flight	$183

Best time to beat the crowds with an average 19% drop in price.

Most popular time to fly with an average 14% increase in price.

Flight from Ottawa to Seattle

How does KAYAK find such low prices on flights from Ontario to Seattle?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Ontario to Seattle?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Lynnwood

Centralia

Fife

Lakewood

Westport

Lacey

Mukilteo

Woodinville

Poulsbo

Edmonds

Aberdeen

DuPont

Shoreline

Monroe

Castle Rock

Edgewood

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Complete your trip to Seattle with a hotel stay or car rental

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$183 Find Cheap Flights from Ontario to Seattle - Compare and Save

Cheap Flights from Ontario to Seattle

Recent round-trip flight deals from Ontario to Seattle

Recent one-way flight deals from Ontario to Seattle

Recent last minute flight deals from Ontario to Seattle

Recent direct flight deals from Ontario to Seattle

Good to know

Low season

High season

Cheapest flight

FAQs for booking flights from Ontario to Seattle

Traveling to a place near Seattle?

More options for your flight to Seattle

Complete your trip to Seattle with a hotel stay or car rental

Information on the airport you'll fly into in Seattle

Cabin class types available on flights to Ontario

Find direct flights for Seattle

Flights from domestic origins to Seattle

Flights to other popular destinations

Find deals for your return flight